linux-kernel - Re: [PATCH v2 5/6] x86/xen: Add a Xen-specific sync

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Message-ID: <20161202193035.mbbryam3r6h6s74x@pd.tnic>
Date:   Fri, 2 Dec 2016 20:30:35 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Borislav Petkov <bp@...nel.org>,
        Andy Lutomirski <luto@...nel.org>, Peter Anvin <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Matthew Whitehead <tedheadster@...il.com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>
Subject: Re: [PATCH v2 5/6] x86/xen: Add a Xen-specific sync_core()
 implementation

On Fri, Dec 02, 2016 at 11:23:09AM -0800, Andy Lutomirski wrote:
> Not even firmware loading wants it.  Firmware loading needs

Microcode...

> specifically cpuid(eax=1).  It has nothing to do with serializing

... but yes, of course. NOT sync_core() but CPUID(1).

Thanks!

-- 
Regards/Gruss,
    Boris.

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